Setting max and min values for creating a random number [duplicate]

Question

I am trying to generate random numbers between 2 and 11, here is my code:

srand(time(NULL));

int card;
card = rand() % 11 + 2;

However, currently my code is creating numbers from 2-12. How could I solve this so that it creates numbers from 2-11?

Does this answer your question? Generating random integer from a range — NutCracker
– NutCracker, Commented Jan 23, 2020 at 18:46
What you want is std::uniform_int_distribution. And please stop using rand() in new code. — Jesper Juhl
– Jesper Juhl, Commented Jan 23, 2020 at 19:36

stark · Accepted Answer · 2020-01-23 19:18:59Z

3

range % 11 has 11 possible vales (0 to 10), but you want 10 possible values (2 to 11), so you first change your mod to % 10. Next, since the values returned by rand() % 10 start at 0, and you want to start at 2, add 2. So:

card = rand() % 10 + 2;

answered Jan 23, 2020 at 19:18

stark

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1 Comment

Jesper Juhl Over a year ago

Using modulo introduces bias (look up the "pidgeon hole principle"). Better to use std::uniform_int_distribution.

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